I have had decent luck this spring using flashers with the lure 5 to 15 feet back and 10-20 feet down. I also use Roemer releases which put the lure about 3 feet above the ball/flashers, for whatever thats worth. I have also had trips where the downriggers don't produce and flatlining leadcore does. I change something (lure type, lure color, depth, etc.) every 20-30 min. if there's been no action. Sometimes you just wind up burning gas$ and rinsing your tackle. Keep at it.